I joined a long queue outside a supermarket. Made sure I kept the 2 m distance. We waited for quite some time and I guess people were getting a bit bored. The man behind me had tried to engage me in conversation and normally I would have responded but I actually think even speaking should be avoided. He then moved his trolley closer to the lady behind him and they started chatting and laughing. They were then certainly not 2 m apart.
It is so difficult to change human behaviour.